"I've been enjoying it!" Aniston tells InStyle.com of her brunette hair. "I was born with this color, and after a few years of playing with highlights I lost complete track of my natural hair shade, so its nice to be back." What prompted Aniston to make the drastic change? We have her current movie project to thank for that. "The truth is, I've been filming a movie for the past five weeks and my hair is partially for the role," the actress says.

Aniston's hair isn't the only part of her look that she's been switching up lately—she's also been going makeup-free. "I haven't been wearing makeup for five weeks straight because I've been in the trenches of filming," she says. "It's been wonderful and pretty liberating."

Her current beauty routine may be minimal, but the star revealed that she's getting back into her usual cosmetics habits, though it hasn't been easy. "I was going to have dinner with a couple of my girlfriends, so I went into the bathroom to do my makeup, but I had no idea what to do," Aniston says. "That ease of throwing on a little mascara and concealer? I felt like I was learning a whole new language!"